SELF HEALING OF AL2O3 WITH TI PARTICLES

Abstract

In this work, a possibility is explored to heal the cracked surface of ceramic materials (alumina matrix ) by embed nanosize titanium particles. In this healing process basically solid state oxidation reactions is takes place at a particular temperature. These composite contain Ti 12% by volume in the matrix of alumina. Mortar and pestle and wet milling machine are used for mixing alumina and titanium powder in respective ratio. Hydraulic press and SPS are used to made pallets.These compact were sintered at 1100°C ,1300°C ,1500°C at 60Mpa pressure in Ar atmosphere. By using vickers indenter with the loads 5 kg and 10 kg for hyadraulic pressed pellet and 5kg to 50 kg for SPS pellet. Scanning electron microscopy is used to investigate the fractured surface behaviour. Healing is done at 800°C for 3 hours ,900°C for 3 hours and 1000 °C for 3 hours. To investigate the surface behaviour again used Scanning electron microscopy. XRD analysis has also done to investigate the compound which is formed after sintering and after healing.